Struggling with My Husband's Prayer Neglect

As a Muslim woman, I married a brother from a known and practicing family. At the time, I didn't realize he struggled with his salah. It's really concerning and hurts my heart that he's the only one in our families who seems to fall short here. We have a daughter, and I see him support her Islamic education when he hears me teaching her. He agrees she should learn, but he doesn't follow through himself. I'm almost certain he's missed many prayers, and he gets defensive or upset when I ask. Sometimes I feel he even fibs about having prayed when he clearly didn't get the chance. Lately, after a big argument over something else, he's been distant, so I can't even bring it up anymore. I really need advice on how to handle this-it feels like a big warning sign, but I'm at a loss. Any helpful tips, insha'Allah?